Interaction-induced excited-band condensate in a double-well optical lattice

Details Interaction-induced excited-band condensate in a double-well optical lattice Interaction-induced excited-band condensate in a double-well optical lattice

2011-04-29

arxiv.org/abs/1105.0012v2

Phys. Rev. A 84, 031607(R) (2011)

Physics

Condensed Matter

Quantum Gases

4pages, 3 figures

Scientific paper

We show theoretically that interaction effects in a double-well optical lattice can induce condensates in an excited band. For a symmetric double-well lattice, bosons condense into the bottom of the excited band at the edge of the Brillouin Zone if the chemical potential is above a critical value. For an asymmetric lattice, a condensate with zero momentum is automatically induced in the excited band by the condensate in the lowest band. This is due to a combined effect of interaction and lattice potential, which reduces the band gap and breaks the inversion symmetry. Our work can be generalized to a superlattice composed of multiple-well potentials at each lattice site, where condensates can be induced in even higher bands.

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